Mr Dahlmann came from Swabia settled i Czestochowa?, Poland, had a grain mill

My great great grandfather Dahlmann lived in the mid to late 1800, he was a master miller who owned a grain mill in Czestochowa? Poland where he had immigrated from Swabia, Baden Wuerthemberg, he raised 6 dughters and the name on that side of the Dahlmann family became extinct. Who has info on the daughters? One of them was Maria, who maried Adolf Gehrmann and settled in Niestempowo/Nestempohl near Gdansk/Danzig. Also, who knows anything about Mr Dahlmann's wife?